Don't want to Hassle
There are a few frameworks to rescue....
Table of contents:
Fibonacci
1 Ernest Hemingway
2 William Shakespeare
3 André Breton
4 Roberto Bolaño
5 Dan Brown
Factorial
6 Jack Kerouac
7 Jane Austen
8 Samuel Johnson
9 Sir Arthur Conan Doyle
10 James Joyce
Happy Numbers
11 J.D. Salinger
12 Tupac Shakur
13 Virginia Woolf
14 Geoffrey Chaucer
15 Vladimir Nabokov
Prime Numbers
16 Jorge Luis Borges
17 Lewis Carroll
18 Douglas Adams
19 Charles Dickens
20 David Foster Wallace
Say It
21 Sylvia Plath
22 Italo Calvino
23 J.K. Rowling
24 Arundhati Roy
25 Franz Kafka
Poetic Interludes
1 Edgar Allan Poe
2 William Shakespeare
3 Dylan Thomas
4 Walt Whitman
| while (true) { | |
| int length; | |
| try { | |
| length = decodeLinePrefix(ps, bStream); | |
| for (i = 0; (i+bytesPerAtom()) < length; i += bytesPerAtom()) { | |
| decodeAtom(ps, bStream, bytesPerAtom()); | |
| totalBytes += bytesPerAtom(); | |
| } | |
| if ((i + bytesPerAtom()) == length) { | |
| decodeAtom(ps, bStream, bytesPerAtom()); | |
| totalBytes += bytesPerAtom(); | |
| } else { | |
| decodeAtom(ps, bStream, length - i); | |
| totalBytes += (length - i); | |
| } | |
| decodeLineSuffix(ps, bStream); | |
| } catch (CEStreamExhausted e) { | |
| break; | |
| } | |
El oxímoron (del griego ὀξύμωρον, oxymoron, en latín contradictio in terminis), dentro de las figuras literarias en retórica, es una figura lógica que consiste en usar dos conceptos de significado opuesto en una sola expresión,1
Ejemplo: «Festina lente», ‘apresúrate lentamente’ (César Augusto, 63 a. C.-14 d. C.)
Flame graphs are a visualization of profiled software, allowing the most frequent code-paths to be identified quickly and accurately.
From Understanding Weak References, by Ethan Nicholas:
Weak referencesAnd Peter Kessler added in a comment:
A weak reference, simply put, is a reference that isn't strong enough to force an object to remain in memory. Weak references allow you to leverage the garbage collector's ability to determine reachability for you, so you don't have to do it yourself. You create a weak reference like this:
and then elsewhere in the code you can useWeakReference weakWidget = new WeakReference(widget);weakWidget.get()to get the actualWidgetobject. Of course the weak reference isn't strong enough to prevent garbage collection, so you may find (if there are no strong references to the widget) thatweakWidget.get()suddenly starts returningnull.
...
Soft references
A soft reference is exactly like a weak reference, except that it is less eager to throw away the object to which it refers. An object which is only weakly reachable (the strongest references to it areWeakReferences) will be discarded at the next garbage collection cycle, but an object which is softly reachable will generally stick around for a while.
SoftReferencesaren't required to behave any differently thanWeakReferences, but in practice softly reachable objects are generally retained as long as memory is in plentiful supply. This makes them an excellent foundation for a cache, such as the image cache described above, since you can let the garbage collector worry about both how reachable the objects are (a strongly reachable object will never be removed from the cache) and how badly it needs the memory they are consuming.
The Sun JRE does treat SoftReferences differently from WeakReferences. We attempt to hold on to object referenced by a SoftReference if there isn't pressure on the available memory. One detail: the policy for the "-client" and "-server" JRE's are different: the -client JRE tries to keep your footprint small by preferring to clear SoftReferences rather than expand the heap, whereas the -server JRE tries to keep your performance high by preferring to expand the heap (if possible) rather than clear SoftReferences. One size does not fit all.
SonarQube Best open source static analyzer.
(IMHO :-) ).
1.
How to create custom plugins for Sonar
https://devwebcl.blogspot.com/2018/10/custom-sonarqube-plugins-63.html
2.
default port: 9000
http://127.0.0.1:9000/
http://localhost:9000/
3.
Maven command line:
mvn sonar:sonar -Dsonar.host.url=http://127.0.0.1:9000 -Dsonar.login=d676f79d8ba83cdcf69f38f8471f0284ee242e09
4.
Quality Gates
Quality Gates are the best way to ensure that standards are met and regulated across all the projects in your organization. Quality Gates can be defined as a set of threshold measures set on your project like Code Coverage, Technical Debt Measure, Number of Blocker/Critical issues, Security Rating, etc.
5.
Quality Profiles
A quality profile in Sonar consists of: A set of activated coding rules among +600 available (PMD, Checkstyle and FindBugs): an activation level (mandatory or optional) and parametrization for each rule.
6.
wsdl jar
to be tested jar wsdl client proxies :
<plugin>
<groupId>org.jvnet.jax-ws-commons</groupId>
<artifactId>jaxws-maven-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<goals>
<goal>wsimport</goal>
</goals>
<configuration>
<wsdlDirectory>${basedir}/src/main/resources/wsdl/</wsdlDirectory>
<wsdlLocation>wsdl/endpoint_sample_wsdl.wsdl</wsdlLocation>
8. sonar-project.properties
to active a project and be used by sonar cli.
Create an user and generate token, then add to properties file:
# must be unique in a given SonarQube instance
sonar.projectKey=my:project
sonar.login=f86a58b7f520bfc6bbdb5bf03a0671ce64860f0c
sonar.java.binaries=target
#to avoid java parsing
sonar.exclusions=**/*.java
9. important not default rules
- https://rules.sonarsource.com/java/RSPEC-3749
Members of Spring components should be injected
- https://rules.sonarsource.com/java/RSPEC-4288
Spring components should use constructor injection
| Class Filename | path | Description |
|---|---|---|
| MyFirstCustomCheck.java | /src/test/files/ | A test file, which contains Java code used as input data for testing the rule |
| org.sonar.template.java.checks. MyFirstCustomCheckTest.java | /src/test/java | A test class, which contains the rule's unit test |
| org.sonar.template.java.checks. MyFirstCustomCheck.java | /src/main/java | A rule class, which contains the implementation of the rule. |
import org.sonar.api.Plugin;
/**
* Entry point of your plugin containing your custom rules
*/
public class MyJavaRulesPlugin implements Plugin {
/**
* Declare rule metadata in server repository of rules.
* That allows to list the rules in the page "Rules".
*/
public class MyJavaRulesDefinition implements RulesDefinition {
// server extensions -> objects are instantiated during server startup
context.addExtension(MyJavaRulesDefinition.class);
// batch extensions -> objects are instantiated during code analysis
context.addExtension(MyJavaFileCheckRegistrar.class);
/**
* Provide the "checks" (implementations of rules) classes that are going be executed during
* source code analysis.
*
* This class is a batch extension by implementing the {@link org.sonar.plugins.java.api.CheckRegistrar} interface.
*/
@SonarLintSide
public class MyJavaFileCheckRegistrar implements CheckRegistrar {
/*Rule Activation
The second things to to is to activate the rule within the plugin. To do so, open class RulesList (org.sonar.samples.java.RulesList). In this class, you will notice methods GetJavaChecks() and GetJavaTestChecks(). These methods are used to register our rules with alongside the rule of the Java plugin.*/
public final class RulesList {
sh ./ParseHeapDump.sh /heapdumps/java_7935_heapdump_4p.hprof org.eclipse.mat.api:suspects org.eclipse.mat.api:overview org.eclipse.mat.api:top_components
| TCP connection state | Abbreviation in MVS™ console | Abbreviation in TSO or UNIX shell | Description |
|---|---|---|---|
| LISTEN | Listen | Listen | Waiting for a connection request from a remote TCP application. This is the state in which you can find the listening socket of a local TCP server. |
| SYN-SENT | SynSent | SynSent | Waiting for an acknowledgment from the remote endpoint after having sent a connection request. Results after step 1 of the three-way TCP handshake. |
| SYN-RECEIVED | SynRcvd | SynRcvd | This endpoint has received a connection request and sent an acknowledgment. This endpoint is waiting for final acknowledgment that the other endpoint did receive this endpoint's acknowledgment of the original connection request. Results after step 2 of the three-way TCP handshake. |
| ESTABLISHED | Estblsh | Establsh | Represents a fully established connection; this is the normal state for the data transfer phase of the connection. |
| FIN-WAIT-1 | FinWt1 | FinWait1 | Waiting for an acknowledgment of the connection termination request or for a simultaneous connection termination request from the remote TCP. This state is normally of short duration. |
| FIN-WAIT-2 | FinWt2 | FinWait2 | Waiting for a connection termination request from the remote TCP after this endpoint has sent its connection termination request. This state is normally of short duration, but if the remote socket endpoint does not close its socket shortly after it has received information that this socket endpoint closed the connection, then it might last for some time. Excessive FIN-WAIT-2 states can indicate an error in the coding of the remote application. |
| CLOSE-WAIT | ClosWt | ClosWait | This endpoint has received a close request from the remote endpoint and this TCP is now waiting for a connection termination request from the local application. |
| CLOSING | Closing | Closing | Waiting for a connection termination request acknowledgment from the remote TCP. This state is entered when this endpoint receives a close request from the local application, sends a termination request to the remote endpoint, and receives a termination request before it receives the acknowledgment from the remote endpoint. |
| LAST-ACK | LastAck | LastAck | Waiting for an acknowledgment of the connection termination request previously sent to the remote TCP. This state is entered when this endpoint received a termination request before it sent its termination request. |
| TIME-WAIT | TimeWt | TimeWait | Waiting for enough time to pass to be sure the remote TCP received the acknowledgment of its connection termination request. |
| CLOSED | Closed | Closed | Represents no connection state at all. |
